Uhm, I see those differences too, and I'm a long-time Mac user. Fonts on Mac OS X ARE fuzzy, there's no denying that. Heck, it's a feature, not a bug.

You're just so used to it that you can't even accept that fact. Try putting a row of i or l, and you'll see a "wave" going through it of ones that are "blacker" than the other. It's clearly obvious and well-documented that it makes absolutely no sense to deny it.